Question

Which of the following expressions are polynomials? Select all that apply.

Answer 1

For expression to be polynomial all the exponent must be non negative.

For first option,

`(2)/(x)-8y=2x^(-1)-8y`

It is not a polynomial expression.

For second option

`3x^2-7y`

No negative exponent, so it is polynomial equation.

For third option,

`4x^2-9`

No negative exponent, so it is polynomial equation.

For fourth option,

`3x^(-2)+y^3`

It is not a polynomial expression.

So option B and C is correct option.